The AvP : Aliens module adds various new effects in correlation to both the player and xenomorphs in a negative and positive fashion for both. Some effects even come as a compatibility with the other modules or have additional effect causers from other mods that the module has compats with.

Effects are separated into three tiers, Scourge, Royal, Unnatural.

Royal - Comes naturally from hives, jelly, or other means.

Scourge - Results from raids, scourge units, or scourge jelly.

Unnatural - Only caused through player interference / creation.

Metamorphosis. - Metamorphosis is given to players that use a potion of Metamorphosis. The effect on players highlights all mobs around them as if they all had Glowing. When used on Xenomorphs it immediately begins an evolving process for them.

Hive’s Bane. - Hive’s Bane is effect gained when using a Potion of Growth Suppression. Hive’s Bane reduces the targets speed by 45%, prevents xenomorphs from evolving and can delay a chestburster from bursting.

Scourge. - Scourge is an effect that works similar to Metamorphosis. Whilst it doesn’t highlight any targets it causes certain Xenomorphs to evolve into their Scourge evolution when splashed with a Potion of Scourge.

Radiation Sickness. - Radiation Sickness is an effect gained when spending too much time near radioactive material, hit by an Irradiated xenomorph or when spending too long within a hive. Radiation Sickness begins weak with slow partial damage but quickly ramps up the longer the effect lasts eventually applying Hunger and Weakness until it begins doing 4 hearts per tick.

Radiation Resistance. - Radiation Resistance is given to players that use an Irradiated Potion. It prevents radiation from developing into fatal levels and prevents early stages of Radiation unless attacked by an Irradiated Xenomorph.